Amplifier



1,648,763 R. H. A ENGLUND 1 AMPLIFIER Filed $12.6. 192s 2 Sheets-Sheet 1p v I 21/ 1 I A TTORNEYS.

Nov. 8, 1927.

R. H. A. ENGLUND AI'WPLIFIER Filed Aug. 6. 1926 2 Sheets-Sheet 2INVENTOR. R. H-. H- ENELUND A TTORNEYS.

Patented Nov. 8, 1927.

UNITED STATES,

REUBEN H. A. ENGLUND, or KENT, WASHINGTON.

AMPLIFIER.

Application filed August 6, 1926. Serial No. 127,638.

This invention relates to improvements in amplifiers and has particularreference to a horn amplifier.

The principal object of this invention is to provide means whereby areproduclng unit such as an ear phone or palr of ear phones or similardevice, may be attached to the horn so that the volume delivered by theunit will be amplified.

Another object is to produce a horn of this character having anincreasing crosssectional area throughout its length.

A further object is to produce a horn wherein an elongated tone chambermay be formed in the minimum amount of space.

Other objects and advantages will be ap parent during the course of thefollowing description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate hke parts throughout thesame.

Figure I is a perspective view of my horn,

Figure II is a Vertical cross-sectlon of my horn,

Figure III is a cross-section taken on the line 33 of Figure II, and

Figure IV is a perspective view of one of the wedge elements.

It is a well known fact that in amplifying.

it is essential to use a tone chamber of considerable length. Thislengthy tone chamber heretofore has resulted in the production.

of horns which were unsightly and therefore objectionable in manyinstances.

I have produced a horn wherein the maxi mum length of the tone chamberhas been maintained and the space required has been reduced.

In the accompanying drawings wherein for the purpose of illustration isshown a preferred embodiment of my invention, the

numeral 5 designates a cabinet having a back member 7 and the end 19 ofthe unit attachment is a rubber connector 12. In order to properlysecure the unit attachment 19 in the bore 8, I provide wedges 13 and 14one of which is shown in Figure IV. I

Secured to the tubular member is a bell 16 which has its free edgeformed in the shaft of a ring 17 which ring abuts the front of thecabinet as illustrated in Figure I.

Securing blocks 18 serve to position the bell 16 which is held theretoby screws 19.

At 21, I have shown a cross-shaped member which is also secured to theblock 18 as by screws 22. This cross-shaped member has secured to itscentral portion a deflector 23 which is provided with a bore 24;.

' Braces 26 equally spaced about the same and secured thereto are alsosecured to the cross-shaped member 21. These braces serve to maintainthe deflector in proper position.

The result of this construction is that when the amplifying unit isattached to the unit attachment 11 music or other sound reproducedtherein will pass through the at tachment 11 and be projected into thetubular member 7. Passing through the tubular member it will engage thedeflector 23 and be deflected through the bore 24 until it reaches thebell 16 where it will be again defiected out of the amplifier into thesurrounding atmosphere.

It will thus be seen that with this con struction I have secured a pathfor the reproduced sound which path is of great length but confinedwithin a minimum amount of space. I

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes relative to the material, size, shape and arrangement ofparts may be resorted to without departing from the spirit of theinvention or the scope of the subjoined claim.

Having thus described my invention, I claim i In an amplifying device ofthe character described, a cabinet having a substantially semi-circularcross section, an end block secured in said cabinet, a tubular elementcentrally positioned within said cabinet, means for connecting a furtherreproducing element to said tubular element, a bell shaped elementpositioned Within said cabinet, said and a plurality of braces securedto said bell shaped element having its end reduced grille and to saiddeflector, said braces being and secured to said tubular element andhavequally spaced about said deflector. ing its flared end secured tosaid cabinet, a In testimony whereof I afiix my signagrille secured tothe open end of said cabinet, ture.

a deflector secured to said grille and surrounding a portion of saidtubular element, REUBEN H. A. ENGLUND.

